c# - 从 Button 链接下载文件到 C 盘上的特定文件夹

Question

我正在抓取网页并导航到正确的位置，但是作为整个 c# 世界的新手，我无法下载 pdf 文件。

链接隐藏在这后面

var reportDownloadButton = driver.FindElementById("company_report_link");

类似于:www.link.com/key/489498-654gjgh6-6g5h4jh/link.pdf

如何下​​载文件到C:\temp\？

这是我的代码:

using System.Linq;
using OpenQA.Selenium.Chrome;

namespace WebDriverTest
{
    class Program
    {
        static void Main(string[] args)
        {

            var chromeOptions = new ChromeOptions();
            chromeOptions.AddArguments("headless");

            // Initialize the Chrome Driver // chromeOptions
            using (var driver = new ChromeDriver(chromeOptions))
            {
                // Go to the home page
                driver.Navigate().GoToUrl("www.link.com");
                driver.Manage().Timeouts().ImplicitWait = System.TimeSpan.FromSeconds(15);
                // Get the page elements
                var userNameField = driver.FindElementById("loginForm:username");
                var userPasswordField = driver.FindElementById("loginForm:password");
                var loginButton = driver.FindElementById("loginForm:loginButton");

                // Type user name and password
                userNameField.SendKeys("username");
                userPasswordField.SendKeys("password");

                // and click the login button
                loginButton.Click();

                driver.Navigate().GoToUrl("www.link2.com");
                driver.Manage().Timeouts().ImplicitWait = System.TimeSpan.FromSeconds(15);

                var reportSearchField = driver.FindElementByClassName("form-control");

                reportSearchField.SendKeys("Company");

                var reportSearchButton = driver.FindElementById("search_filter_button");
                reportSearchButton.Click();

                var reportDownloadButton = driver.FindElementById("company_report_link");
                reportDownloadButton.Click();

---

编辑:

---

编辑 2:

我还不是 Stackoverflow 社区中最锋利的笔。我不明白如何使用 Selenium 来做到这一点。我已经用

完成了

        var reportDownloadButton = driver.FindElementById("company_report_link");
        var text = reportDownloadButton.GetAttribute("href");
        // driver.Manage().Timeouts().ImplicitWait = System.TimeSpan.FromSeconds(15);

        WebClient client = new WebClient();
        // Save the file to desktop for debugging
        var desktop = System.Environment.GetFolderPath(System.Environment.SpecialFolder.Desktop);
        string fileName = desktop + "\\myfile.pdf";
        client.DownloadFile(text, fileName);

不过网页似乎有点棘手。我得到了

System.Net.WebException: 'The remote server returned an error: (401) Unauthorized.'

调试器指向:

client.DownloadFile(text, fileName);

我觉得应该是真的模拟右键点击链接另存为，不然这个下载不了。另外，如果我只是点击按钮，它会在新的 Chrome 标签页中打开 PDF。

---

编辑 3:

应该是这样的吧？

using System.Linq;
using OpenQA.Selenium.Chrome;

namespace WebDriverTest
{
    class Program
    {
        static void Main(string[] args)
        {

    // declare chrome options with prefs
    var options = new ChromeOptionsWithPrefs();
    options.AddArguments("headless"); // we add headless here

    // declare prefs
        options.prefs = new Dictionary<string, object>
        {
            { "download.default_directory", downloadFilePath }
        };

    // declare driver with these options
    //driver = new ChromeDriver(options); we don't need this because we already declare driver below.

            // Initialize the Chrome Driver // chromeOptions
            using (var driver = new ChromeDriver(options))
            {
                // Go to the home page
                driver.Navigate().GoToUrl("www.link.com");
                driver.Manage().Timeouts().ImplicitWait = System.TimeSpan.FromSeconds(15);
                // Get the page elements
                var userNameField = driver.FindElementById("loginForm:username");
                var userPasswordField = driver.FindElementById("loginForm:password");
                var loginButton = driver.FindElementById("loginForm:loginButton");

                // Type user name and password
                userNameField.SendKeys("username");
                userPasswordField.SendKeys("password");

                // and click the login button
                loginButton.Click();

                driver.Navigate().GoToUrl("www.link.com");
                driver.Manage().Timeouts().ImplicitWait = System.TimeSpan.FromSeconds(15);

                var reportSearchField = driver.FindElementByClassName("form-control");

                reportSearchField.SendKeys("company");

                var reportSearchButton = driver.FindElementById("search_filter_button");
                reportSearchButton.Click();

                driver.Manage().Timeouts().ImplicitWait = System.TimeSpan.FromSeconds(15);
                driver.Navigate().GoToUrl("www.link.com");

                // click the link to download
                var reportDownloadButton = driver.FindElementById("company_report_link");
                reportDownloadButton.Click();

                // if clicking does not work, get href attribute and call GoToUrl() -- this may trigger download
                var href = reportDownloadButton.GetAttribute("href");
                driver.Navigate().GoToUrl(href);

                }
            }
        }

    }
}

Answer 1

您可以尝试设置 download.default_directory Chrome 驱动程序首选项:

// declare chrome options with prefs
var options = new ChromeOptionsWithPrefs();

// declare prefs
    options.prefs = new Dictionary<string, object>
    {
        { "download.default_directory", downloadFilePath }
    };

// declare driver with these options
driver = new ChromeDriver(options);


// ... run your code here ...

// click the link to download
var reportDownloadButton = driver.FindElementById("company_report_link");
reportDownloadButton.Click();

// if clicking does not work, get href attribute and call GoToUrl() -- this may trigger download
var href = reportDownloadButton.GetAttribute("href");
driver.Navigate().GoToUrl(href);

如果 reportDownloadButton 是触发下载的链接，则文件应下载到您在 download.default_directory 中设置的 filePath。

这些线程都不在 C# 中，但它们谈到了类似的问题:

How to control the download of files with Selenium + Python bindings in Chrome

How to use chrome webdriver in selenium to download files in python?